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Periodic Table of Elements
Elements <ul><li>Science has come along way since Aristotle’s theory of Air, Water, Fire, and Earth. </li></ul><ul><li>Sci...
 
Groups  Periods <ul><li>Columns of elements are called groups or families.  </li></ul><ul><li>Elements in each family have...
 
 
 
Properties of Non-Metals <ul><li>Non-metals are poor conductors of heat and electricity. </li></ul><ul><li>Non-metals are ...
Properties of Metals <ul><li>Metals are good conductors of heat and electricity. </li></ul><ul><li>Metals are shiny. </li>...
Properties of Metalloids <ul><li>Metalloids (metal-like) have properties of both metals and non-metals. </li></ul><ul><li>...
Valence Electrons <ul><li>Valence electrons are the electrons in the outer energy level of an atom. </li></ul><ul><li>Thes...
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What does it mean to be reactive? <ul><li>Elements that are reactive bond easily with other elements to make compounds. </...
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Periodic table

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Periodic table

  1. 1. Periodic Table of Elements
  2. 2. Elements <ul><li>Science has come along way since Aristotle’s theory of Air, Water, Fire, and Earth. </li></ul><ul><li>Scientists have identified 90 naturally occurring elements, and created about 28 others. </li></ul>
  3. 4. Groups Periods <ul><li>Columns of elements are called groups or families. </li></ul><ul><li>Elements in each family have similar but not identical properties. </li></ul><ul><li>All elements in a family have the same number of valence electrons. </li></ul><ul><li>Each horizontal row of elements is called a period. </li></ul><ul><li>The elements in a period are not alike in properties. </li></ul><ul><li>The first element in a period is always an extremely active solid. The last element in a period, is always an inactive gas. </li></ul><ul><li>Have the same number of energy levels. </li></ul>
  4. 8. Properties of Non-Metals <ul><li>Non-metals are poor conductors of heat and electricity. </li></ul><ul><li>Non-metals are not ductile or malleable. </li></ul><ul><li>Solid non-metals are brittle and break easily. </li></ul><ul><li>They are dull. </li></ul><ul><li>Many non-metals are gases. </li></ul>Sulfur
  5. 9. Properties of Metals <ul><li>Metals are good conductors of heat and electricity. </li></ul><ul><li>Metals are shiny. </li></ul><ul><li>Metals are ductile (can be stretched into thin wires). </li></ul><ul><li>Metals are malleable (can be pounded into thin sheets). </li></ul><ul><li>A chemical property of metal is its reaction with water which results in corrosion. </li></ul>
  6. 10. Properties of Metalloids <ul><li>Metalloids (metal-like) have properties of both metals and non-metals. </li></ul><ul><li>They are solids that can be shiny or dull. </li></ul><ul><li>They conduct heat and electricity better than non-metals but not as well as metals. </li></ul><ul><li>They are ductile and malleable. </li></ul>Silicon
  7. 11. Valence Electrons <ul><li>Valence electrons are the electrons in the outer energy level of an atom. </li></ul><ul><li>These are the electrons that are transferred or shared when atoms bond together. </li></ul>
  8. 12. 5
  9. 15. What does it mean to be reactive? <ul><li>Elements that are reactive bond easily with other elements to make compounds. </li></ul><ul><li>What makes an element reactive? </li></ul><ul><li>An incomplete valence electron level. </li></ul><ul><li>All atoms (except hydrogen) want to have 8 electrons in their very outermost energy level (This is called the rule of octet.) </li></ul><ul><li>Atoms bond until this level is complete. Atoms with few valence electrons lose them during bonding. Atoms with 6, 7, or 8 valence electrons gain electrons during bonding. </li></ul>

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